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Stockholders' Equity - Equity Incentive Plans (Details) - USD ($)
1 Months Ended
Oct. 01, 2020
May 31, 2019
Sep. 30, 2021
Dec. 31, 2020
Common Class A | Signal Sciences Corp.        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock options assumed (in shares) 251,754      
Shares issuable pursuant to the ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum deduction of eligible compensation   15.00%    
Maximum purchase value during offering period, per employee   $ 25,000    
Shares issuable pursuant to the ESPP | Common Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares reserved for future issuance (in shares)     4,600,000 3,500,000
Common stock, shares available for future issuance (in shares)     3,800,000 2,800,000
2011 Equity Incentive Plan | Common Class B        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares reserved for future issuance (in shares)       23,600,000
Common stock, shares available for future issuance (in shares)       0
2011 Equity Incentive Plan | Common Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares reserved for future issuance (in shares)     23,600,000  
Common stock, shares available for future issuance (in shares)     0  
2019 Equity Incentive Plan | Common Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares reserved for future issuance (in shares)     25,100,000 19,400,000
Common stock, shares available for future issuance (in shares)     17,100,000 12,800,000